{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.8esu/vex/2026/cve-2026-91777-els_os-tuxcare9_8esu.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-10-24T16:23:54Z",
      "generator": {
        "date": "2026-10-24T16:23:54Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-91777-ELS_OS-TUXCARE9.8ESU",
      "initial_release_date": "2026-09-23T02:21:48Z",
      "revision_history": [
        {
          "date": "2026-09-23T02:21:48Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-10-24T16:23:54Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2026-91777"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "AlmaLinux 9.8",
                "product": {
                  "name": "AlmaLinux 9.8",
                  "product_id": "AlmaLinux-9.8",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:almalinux:almalinux:9.8:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "AlmaLinux"
          }
        ],
        "category": "vendor",
        "name": "AlmaLinux OS Foundation"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Rocky Linux 9.8",
                "product": {
                  "name": "Rocky Linux 9.8",
                  "product_id": "Rocky Linux-9.8",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:resf:rocky_linux:9.8:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Rocky Linux"
          }
        ],
        "category": "vendor",
        "name": "Rocky Linux"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
                "product": {
                  "name": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
                  "product_id": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/pki-jackson-databind@2.21.6-1.el9_8.1.tuxcare.els2?arch=noarch"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch as a component of AlmaLinux 9.8",
          "product_id": "AlmaLinux-9.8:pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch"
        },
        "product_reference": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
        "relates_to_product_reference": "AlmaLinux-9.8"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch as a component of Rocky Linux 9.8",
          "product_id": "Rocky Linux-9.8:pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch"
        },
        "product_reference": "pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
        "relates_to_product_reference": "Rocky Linux-9.8"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-91777",
      "notes": [
        {
          "category": "description",
          "text": "Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the equivalent implementation in MapDeserializer. When a document first creates N unresolved object-ID references in an identity-enabled collection or map and then defines those same IDs in reverse order, completion performs on the order of N * (N + 1) / 2 identity comparisons, so a shallow document whose size grows linearly causes quadratic CPU work during deserialization. The reporter instrumented equals() calls on the ID class and measured exactly 2,003,000 comparisons at N = 2,000, against zero comparisons in the pending-reference lookup path for an equally sized control in which every reference was already resolved. The input requires no deep nesting and no syntactically unusual JSON. Exploitation requires an application that deserializes attacker-influenced JSON into an identity-enabled collection or map. The fix replaces the repeated linear lookup with a keyed pending-reference structure.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "under_investigation": [
          "AlmaLinux-9.8:pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
          "Rocky Linux-9.8:pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-91777"
        }
      ],
      "release_date": "2026-09-23T02:21:48Z",
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-10-15T11:57:57.802514Z",
          "details": "Affected",
          "product_ids": [
            "AlmaLinux-9.8:pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch",
            "Rocky Linux-9.8:pki-jackson-databind-0:2.21.6-1.el9_8.1.tuxcare.els2.noarch"
          ]
        }
      ]
    }
  ]
}